G-60 Caliper pins
b.benz at charter.net
Tue Jun 8 09:17:10 EDT 2004
> From: Kneale Brownson <knotnook at traverse.com>
> They're G60 calipers. I have no idea of their history in the car's first
> 140k miles (now something like 215k). I never noticed the pin looseness in
> the past, but, of course, I had only checked them when I relubed them and
> didn't look for something that might cause misbehavior because there was no
> hanging up in my experience with them. I understand that they should be
> "snug" but slide easily. I've used the ability of the rubber boot being
> able to move the pins from either extended or compressed position as my
> guide for being sufficiently slippery. I understand about the pins having
> flats on them.
> So, would the extra looseness possibly cause the hangup?
I doubt that it would. Have you ever overhauled the calipers? If not, I'd
start there. Frequent fluid changes since your ownership will not correct a
previously abused caliper. You need those under sized calipers to be in the
best of condition on a 200-20V.
> At 08:32 PM 6/7/2004 -0700, Bernie Benz wrote:
>>> From: Kneale Brownson <knotnook at traverse.com>
>>> The right front brake has been binding up the last couple of days. I got
>>> the caliper off and the top pin has a definite looseness. I can wobble it
>>> back and forth inside the bracket even when the boot is fully compressed.
>>> Is this the likely source of the binding? The bottom pin is snug in its
>>> hole. Both were lubed within the last eight or nine months. I bleed the
>>> brakes every time I switch from summer to winter tires or back, so I don't
>>> think the fluid was bad (except now, of course, after the overheating from
>>> the binding). I'm going to replace the bracket and pins, but I just
>>> wondered if the looseness could cause the pin to not slide properly and
>>> release the pads.
>> Kneale, G60s or UFOs?
>> With either, the guide pins should be "snug", not "sloppy loose" within
>> their bushings in the pad carrier. Don't judge the pins by their
>> appearance, inasmuch as they have 3 flats on them over their full length to
>> allow for the escape from the blind hole of air and excessive lub upon
>> assembly. Excessive pin/bushing wear could occur only if the protective boot
>> were compromised over a long period of time, not just in one season, IMO.
>> Apparently at one time, Audi had a "pad carrier cap repair kit, 443 698 470"
>> for G60s which I assume is for the pin bushing within the pad carrier? No
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